四川省上市公司可持续发展财务问题分析

财务指标是企业盈利能力的反映。根据近几年的相关数据,通过对财务指标综合分析,探讨四川省上市公司的可持续发展状况。     

红鳍东方鲀(Takifugu rubripes)性别差异微卫星标记的筛选

采用以BSA为基础的微卫星标记技术对红鳍东方鲀(Takifugu rubripes)雌、雄群体进行性别差异标记筛选的研究。用雌、雄各30个个体构建雌、雄基因池,利用66对微卫星引物扫描雌、雄基因池。在雌、雄基因池中扩增出差异条带的引物有8对。用两个各包括30个雌、雄个体的群体对这8对引物进行两轮个体验证。结果表明,引物f383在两个雌、雄群体中扩增出的差异条带与性别都呈极显著相关性(r分别为0.710和0.673)(P0.01),f383是与红鳍东方鲀雄性呈正相关的微卫星标记。红鳍东方鲀性别差异微卫星标记的获得,为其性别相关基因的克隆和性别决定机制的研究提供理论基础。     

Mitigation of Ice-Induced Vibrations for Offshore Platforms Using Tuned Mass Damper

The problems of ice-induced vibration have been noticed and concerned since the 1960s, but it has not been well resolved. One reason is that the dynamic interaction between ice and structure is so complicated that practical ice force model has not been developed. The recent full-scale tests conducted on jacket platforms in the Bohai Sea presented that ice could cause intense vibrations which endanger the facilities on the deck and make discomfort for the crew. In this paper, the strategy of mitigation of ice-induced offshore structure vibration is discussed. Based on field observations and understanding of the interaction between ice and structure, the absorption mitigation method to suppress ice-induced vibration is presented. The numerical simulations were conducted for a simplified model of platform attached with a Tuned Mass Danlper （TMD） under ice force function and ice force time history. The simulation results show that TMD can fa- vorably reduce ice-induced vibrations, therefore, it can be considered to be an alternative approach to utilize. Finally, the application possibilities of utilizing TMDs on other miniature offshore structures in ice-covered areas of marginal oil fields are discussed.     

Ice-Induced Fatigue Analysis by Spectral Approach for Offshore Jacket Platforms with Ice-Breaking Cones

The spectral methods and ice-induced fatigue analysis are discussed based on Miner's linear cumulative fatigue hypothesis and S-N curve data.According to the long-term data of full-scale tests on the platforms in the Bohai Sea,the ice force spectrum of conical structures and the fatigue environmental model are established.Moreover,the finite element model of JZ20-2MSW platform,an example of ice-induced fatigue analysis,is built with ANSYS software.The mode analysis and dynamic analysis in frequency domain under all kinds of ice fatigue work conditions are carried on,and the fatigue life of the structure is estimated in detail.The methods in this paper can be helpful in ice-induced fatigue analysis of ice-resistant platforms.     

唐山市海岸带用地结构及其生态系统服务价值的时空变化研究

文章对唐山市沿海地区1991—2015年土地利用和结构变化及其生态系统服务价值进行核算分析和量化评估。结果表明:1991—2015年唐山市海岸带主要地物类型涉及耕地、公路用地、河流水面、建设用地、坑塘水面、盐田、填海用地和裸地,其中坑塘水面占地最多,海岸带开发利用总面积不断增大,用地类型有所转化且向海域扩张,新增用地主要来自围填海且以填海造地为主;海岸带生态系统服务价值呈逐年下降的趋势,以2006—2010年变化最为明显,主要原因为海水面积减少。在充分认识填海造地活动双面性的基础上,建议慎重开展填海造地,集约节约利用海洋空间资源,合理科学规划填海区域,提高海洋资源利用效率。     

秋季东、黄海异养细菌(Heterotrophic Bacteria)的分布特点

2000年10-11月,乘"北斗号"考察船进行秋季"东、黄海生态系统动力学与生物资源可持续利用"大面调查,研究秋季东、黄海异养细菌的分布.结果表明,异养细菌在黄海和东海的丰度分别在(2.37-13.33)×108 cell/L和(3.05-13.62)×108 cell/L之间.细菌丰度最高值出现在长江口附近,且断面E和断面F各站位的细菌丰度明显高于其他断面.异养细菌丰度大小以长江口为中心向外海依次递减.东、黄海水体异养细菌生物量分别在244.45-1812.90mgC/m2和100.60-940.87mgC/m2之间.东、黄海异养细菌丰度无显著差异,但是东海海域水体异养细菌生物量高于黄海海域.异养细菌空间分布与浮游植物叶绿素在东海有一定的相关性,黄海异养细菌与硝酸盐浓度的相关性极显著.     

资源环境模型库管理系统研究进展

资源环境模型库管理系统是资源环境研究中的关键问题之一。建立资源环境模型库管理 系统通常有两种途径。一种途径是采用模型管理技术, 其主要方法包括数据式模型管理、结构化 模型管理、面向对象的模型管理和基于知识的模型管理, 这种方式的优势是可以有效地管理资源 环境模型, 但对空间数据处理的功能较弱, 需要编写大量的程序代码。另一种途径是在GIS 中管 理模型, 如ArcGIS 中的ModelBuilder, 这种方式的优点是可以充分利用GIS 的空间数据处理能 力, 但对复杂模型的支持较差。根据以上两种方式的特点, 本文提出了一种面向对象的资源环境 模型管理框架, 把模型抽象为模型类与模型实例, 采用面向对象方法表达模型, 通过构建资源环 境模型引擎处理空间数据和模型数学方程; 利用模型库和数据库, 可以实现模型的有效管理和模 型重用。     

散乱数据插值的HASM方法

本文运用高精度曲面建模(HASM)方法,研究了空间散乱数据插值算法,并以陕西咸阳彬县大佛寺煤矿区的实测数据为案例,使用交叉统计检验方法比较分析HASM方法与地理信息系统(GIS)领域中常用传统插值方法的空间插值结果。结果表明,HASM方法具有较高的精度。本文还分析了传统常用插值方法的一些统计结果,得出一些结论,这些结论对于使用常用传统GIS空间插值方法的研究者有很好的参考作用。     

Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E

The ultraslow-spreading Southwest Indian Ridge(SWIR) to the east of the Melville fracture zone is characterized by very low melt supply and intensive tectonic activity. Due to its weak thermal budget and extremely slow spreading rate, the easternmost SWIR was considered to be devoid of hydrothermal activity until the discovery of the inactive Mt. Jourdanne hydrothermal field(27°51′S, 63°56′E) in 1998. During the COMRA DY115-20 cruise in2009, two additional hydrothermal fields(i.e., the Tiancheng(27°51′S, 63°55′E) and Tianzuo(27°57′S, 63°32′E)fields) were discovered. Further detailed investigations of these two hydrothermal sites were conducted by Chinese manned submersible Jiaolong in 2014–2015. The Tiancheng filed can be characterized as a lowtemperature(up to 13.2°C) diffuse flow hydrothermal field, and is hosted by fractured basalts with hydrothermal fauna widespread on the seafloor. The Tianzuo hydrothermal field is an inactive sulfide field, which is hosted by ultramafic rocks and controlled by detachment fault. The discovery of the three hydrothermal fields around Segment #11 which receives more melt than the regional average, provided evidence for local enhanced magmatism providing heat source to drive hydrothermal circulation. We further imply that hydrothermal activity and sulfide deposits may be rather promising along the easternmost SWIR.     

球石藻及其生态功能

球石藻(Coccolithophore)是一类在全球海洋中广泛分布的海洋微型浮游植物,它们在海洋浮游植物功能群落中是一类极其重要的钙化生物类群,也是海洋中生源无机碳的重要来源,并且在海洋的碳循环过程中起到重要的作用。球石藻由于快速增殖而发生水华的过程中能够释放大量的具有挥发性的二甲基硫(DMS)和丙烯酸(acrylic acid),它们是影响气候变化,特别是引起区域性环境效应(温室效应)的关键性物质。本文针对球石藻的生物学特征及其生态重要性作了简要阐述。